Lenovo ThinkSystem SR645 V3 1U Rack Server
PRODUCT DESCRIPTION
Lenovo ThinkSystem SR645 V3 1U Rack Server (Configure-to-Order) - Local Warranty
1U, Dual-Socket AMD EPYC Density
The Lenovo ThinkSystem SR645 V3 is a 1U rack server for one or two AMD EPYC processors, either 5th Gen EPYC 9005 or 4th Gen EPYC 9004, with up to 160 cores per processor and up to 400 W TDP. 24 DDR5 DIMM slots (12 channels per processor) take up to 6 TB of memory at up to 6400 MHz with 5th Gen EPYC.
Flexible Storage and I/O in 1U
Front bays take 4 x 3.5-inch, 10 x 2.5-inch or 16 x E1.S EDSFF drives, with optional rear 2.5-inch or 7 mm bays, onboard NVMe and SATA, or 12 Gb SAS/SATA RAID adapters. Up to five PCIe slots plus a dedicated OCP 3.0 slot with a PCIe 5.0 x16 interface suit cloud, virtualisation, VDI and database workloads.
Managed by Lenovo XClarity
XClarity Controller 2 (XCC2) provides embedded out-of-band management, with optional XCC Platinum and Lenovo XClarity One for centralised fleet management. A Root of Trust module with TPM 2.0 and Platform Firmware Resiliency protects the firmware.
Lenovo ThinkSystem SR645 V3 Datasheet — Technical Specifications
General
| Product Name | Lenovo ThinkSystem SR645 V3 Rack Server |
| Machine Types | 7D9C (3-year warranty), 7D9D (1-year warranty) |
| Form Factor | 1U rack server |
| Order Type | Configure-to-Order (CPU, memory, drives, RAID, NIC, PSU and support term chosen per order) |
| Warranty | Three-year or one-year (depending on machine type) customer-replaceable unit and onsite limited warranty, 9x5 next business day; service upgrades selected at configuration |
Processor & Memory
| Processors | One or two AMD EPYC processors, 5th Gen 9005 or 4th Gen 9004; up to 160 cores per processor, up to 400 W TDP |
| Chipset | None (platform controller functions integrated into the processor) |
| Memory Slots | 24 DDR5 DIMM slots (12 per processor, 12 channels per processor, 1 DIMM per channel) |
| Maximum Memory | 6 TB (24 x 256 GB 3DS RDIMMs) |
| Memory Speed | Up to 6400 MHz (5th Gen EPYC); up to 4800 MHz (4th Gen EPYC) |
| Memory Protection | ECC, SDDC, Patrol/Demand Scrubbing, Bounded Fault, DRAM Address Command Parity with Replay, DRAM Uncorrected ECC Error Retry, On-die ECC, ECS, Post Package Repair |
Storage
| Front Drive Bays | 4 x 3.5" hot-swap, 10 x 2.5" hot-swap or 16 x E1.S EDSFF |
| Rear Drive Bays | 2 x 2.5" hot-swap SAS/SATA or 2 x 7 mm hot-swap drives (optional) |
| Total Drive Bays | Up to 4 x 3.5", 12 x 2.5" or 16 x EDSFF hot-swap |
| Maximum Internal Storage | 1474.56 TB (12 x 122.88 TB 2.5" NVMe SSDs) |
| Storage Controllers | Onboard NVMe (no RAID, 12 drives), onboard SATA (no RAID, 12 drives), NVMe retimer adapter, 12 Gb SAS/SATA RAID adapters (8, 16 or 32 ports) |
| Optical Drive | No internal optical drive |
Expansion & Networking
| PCIe Slots | Up to 5 slots (3 rear, 2 front) plus 1 OCP 3.0 slot |
| GPU Support | Up to 5 x single-width GPUs, up to 75 W each |
| Network | Dedicated OCP 3.0 SFF slot, PCIe 5.0 x16 host interface; 2-port and 4-port 1GbE, 10GbE and 25GbE adapters |
| Front Ports | 1 x USB 3.2 Gen 1, 1 x USB 2.0, external diagnostics port, optional VGA |
| Rear Ports | 3 x USB 3.2 Gen 1, 1 x VGA, 1 x RJ-45 1GbE management port |
| Video | Embedded graphics with 16 MB memory, up to 1920x1200 32 bpp at 60 Hz |
Management & Security
| Embedded Management | Lenovo XClarity Controller 2 (XCC2); optional XCC Platinum upgrade |
| Fleet Management | Lenovo XClarity One |
| Security | Root of Trust module with TPM 2.0, Platform Firmware Resiliency (PFR), chassis intrusion switch, power-on and administrator passwords |
Power, Cooling & Physical
| Power Supplies | Up to two hot-swap redundant AC PSUs, 80 PLUS Platinum or Titanium: 500 W, 750 W, 1100 W, 1800 W |
| Cooling | Up to 8 x N+1 redundant hot-swap 40 mm fans; optional closed-loop liquid-cooled heatsink or open-loop water cooling |
| Hot-Swap Parts | Drives, power supplies and fans |
| Dimensions (H x W x D) | 43 x 440 x 773 mm |
| Weight | Up to 20.2 kg |
How to Configure Your Server — Sizing Checklist
Servers are built to order. Answer the questions below so we can size the right configuration for you.
Step 1: Hardware Requirements
- Which server form factor do you need: tower or rackmount?
- How many CPU cores, how much RAM and how much usable storage capacity do you require?
- How many processors: single-socket (1S), dual-socket (2S) or four-socket (4S)?
- Which RAID configuration do you need? Any specific HDD or SSD type, such as 7.2K or 10K rpm drives?
- Which network interface is required: 1GbE Base-T, SFP+ or Fibre Channel?
- How many years of maintenance support do you need? (Minimum 3 years)
Step 2: Deployment & Services
- How many server units are required?
- Will you run virtual machine workloads? Do you need a VMware licence, or Windows Server with Hyper-V?
- How do you store data today? Do you have existing NAS or SAN storage?
- How do you back up today? Would you like a backup proposal, such as an IDPA 8TB appliance?
- Do you require burn-in test services?
- Do you need hard disk retention services?
Operating Systems, Management & Workloads
Operating Systems & Hypervisors
Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware ESXi and Canonical Ubuntu Server. Check Lenovo's OS Interoperability Guide for the versions certified on your chosen processor.
Management Tools
XClarity Controller 2 gives out-of-band console, monitoring and alerting from day one. Lenovo XClarity One adds centralised management of multiple ThinkSystem servers.
Typical Workloads
Cloud computing, server virtualisation, VDI, enterprise applications and database management where rack space is at a premium.
Package Contents & Lenovo ThinkSystem Servers Ordering Information
What Is Supplied
The SR645 V3 is built to order: chassis with the processors, memory, drives, storage controller, network adapters and power supplies specified on your quotation, plus rail kit, bezel and power cords where ordered.
Lenovo ThinkSystem Servers
| Model | Key feature |
| ThinkSystem ST650 V3 | Tower, 2-socket 4th/5th Gen Intel Xeon |
| ThinkSystem SR250 V3 | 1U, 1-socket Intel Xeon E-2400 |
| ThinkSystem SR630 V3 | 1U, 2-socket 4th/5th Gen Intel Xeon |
| ThinkSystem SR650 V3 | 2U, 2-socket 4th/5th Gen Intel Xeon |
| ThinkSystem SR630 V4 | 1U, 2-socket Intel Xeon 6 |
| ThinkSystem SR650 V4 | 2U, 2-socket Intel Xeon 6 |
| ThinkSystem SR650a V4 | 2U, 2-socket Intel Xeon 6, up to 4 double-wide GPUs |
| ThinkSystem SR645 V3 (this listing) | 1U, 2-socket AMD EPYC |
| ThinkSystem SR655 V3 | 2U, 1-socket AMD EPYC |
| ThinkSystem SR665 V3 | 2U, 2-socket AMD EPYC |
| ThinkSystem SR675 V3 | 3U GPU server, up to 8 GPUs |
| ThinkSystem SR680a V3 | 8U, 8 x NVIDIA SXM GPUs |
| ThinkSystem SR685a V3 | 8U, 8 x NVIDIA SXM or AMD Instinct GPUs |
| ThinkSystem SR780a V3 | 5U, 8 x NVIDIA SXM GPUs, Neptune liquid cooling |
Datasheet & Downloads
| Product guide | Lenovo ThinkSystem SR645 V3 Server Product Guide (Lenovo Press) |
| Datasheet | Lenovo ThinkSystem SR645 V3 Datasheet (Lenovo Press) |
| 3D tour | ThinkSystem SR645 V3 interactive 3D tour |
| Lenovo product page | ThinkSystem SR645 V3 on lenovo.com |
Frequently Asked Questions — Lenovo ThinkSystem SR645 V3
Is this a fixed configuration?
No. The SR645 V3 is configure-to-order. Processors, memory, drives, storage controller, network adapters, power supplies and the support term are specified to your workload; use the sizing checklist above to brief us.
How much memory can it take?
24 DDR5 DIMM slots for up to 6 TB, running at up to 6400 MHz with 5th Gen AMD EPYC processors.
Which AMD processors does it support?
One or two 5th Gen AMD EPYC 9005 or 4th Gen AMD EPYC 9004 processors, with up to 160 cores per processor.
Does it support GPUs?
Yes, up to five single-width GPUs of up to 75 W each, suited to inference and VDI acceleration in a 1U chassis.
SR645 V3 or SR665 V3?
Both are 2-socket AMD EPYC servers. The SR645 V3 packs the platform into 1U; the 2U SR665 V3 adds more drive bays (up to 40 x 2.5-inch), more PCIe slots and up to three double-wide GPUs.
